21113011626545 has 8 divisors (see below), whose sum is σ = 26825944184424. Its totient is φ = 15896855812864.

The previous prime is 21113011626529. The next prime is 21113011626559. The reversal of 21113011626545 is 54562611031112.

It can be written as a sum of positive squares in 4 ways, for example, as 2040235143424 + 19072776483121 = 1428368^2 + 4367239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21113011626545 - 2⁴ = 21113011626529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113011626499 and 21113011626508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124194185954 + ... + 124194186123.

It is an arithmetic number, because the mean of its divisors is an integer number (3353243023053).

Almost surely, 2^{21113011626545} is an apocalyptic number.

It is an amenable number.

21113011626545 is a deficient number, since it is larger than the sum of its proper divisors (5712932557879).

21113011626545 is a wasteful number, since it uses less digits than its factorization.

21113011626545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248388372099.

The product of its (nonzero) digits is 43200, while the sum is 38.

Adding to 21113011626545 its reverse (54562611031112), we get a palindrome (75675622657657).

The spelling of 21113011626545 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, six hundred twenty-six thousand, five hundred forty-five".